From: Andi Kleen <ak@linux.intel.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
the arch/x86 maintainers <x86@kernel.org>,
Miroslav Benes <mbenes@suse.cz>
Subject: Re: objtool warnings for kernel/trace/trace_selftest_dynamic.o
Date: Mon, 17 Dec 2018 20:22:06 -0800 [thread overview]
Message-ID: <20181218042206.GC25620@tassilo.jf.intel.com> (raw)
In-Reply-To: <20181218024916.vmfnyqzouhfxhyvc@treble>
> The plugin is only used for older versions of GCC. Newer versions have
> the same functionality builtin with -fsanitize-coverage=trace-pc.
Ok and the frame pointer issue is with the older version only?
>
> So the problem is GCC. We're using a function attribute which at least
> oneGCC developer doesn't recommend. If you want to keep the LTO support
> then '__used' seems like a much better choice.
I guess __used will work for now.
Still would be better to root cause it properly, but I guess that's
ok for now. The lack of understanding may eventually come back
to bite you later.
FWIW i did some tests and I don't see noclone affecting frame pointer
with gcc 8. The only thing I saw was that empty functions ended up
without frame pointer.
I suspect you'll need to fix up the other users of noclone too.
-Andi
next prev parent reply other threads:[~2018-12-18 4:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-16 18:33 Arnd Bergmann
2018-12-17 17:39 ` Josh Poimboeuf
2018-12-17 18:04 ` Andi Kleen
2018-12-17 18:16 ` Josh Poimboeuf
2018-12-17 19:29 ` Peter Zijlstra
2018-12-17 20:55 ` Andi Kleen
2018-12-17 22:35 ` Peter Zijlstra
2018-12-17 23:59 ` Andi Kleen
2018-12-18 9:19 ` Peter Zijlstra
2018-12-18 21:22 ` Andi Kleen
2018-12-17 21:31 ` Josh Poimboeuf
2018-12-17 22:36 ` Steven Rostedt
2018-12-18 0:06 ` Andi Kleen
2018-12-18 2:49 ` Josh Poimboeuf
2018-12-18 4:22 ` Andi Kleen [this message]
2018-12-18 9:28 ` Miroslav Benes
2018-12-18 12:15 ` Martin Jambor
2018-12-18 12:31 ` Steven Rostedt
2018-12-18 14:01 ` Josh Poimboeuf
2018-12-18 21:20 ` Andi Kleen
2018-12-19 3:44 ` Sean Christopherson
2018-12-19 17:31 ` Martin Jambor
2018-12-18 21:15 ` Andi Kleen
2018-12-18 21:57 ` Steven Rostedt
2018-12-18 22:13 ` Andi Kleen
2018-12-18 22:16 ` Steven Rostedt
2018-12-18 23:26 ` Andi Kleen
2018-12-18 23:40 ` Steven Rostedt
2018-12-19 17:38 ` Martin Jambor
2018-12-18 3:05 ` Josh Poimboeuf
2018-12-17 23:54 ` Andi Kleen
2018-12-17 21:03 ` Andi Kleen
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